Thermostat



Dec. 26, 1922. 1,439,897. P. B. JOHNSON.

THERMOSTAT.

ORIGINAL FILED 00T. ze. I92o.

Patented Dec. 26, i922.

u i i scr-aires iaaaeai recense. aoiinson, or snii'r'riinwasnmeron.

' irnnaliros'r'ar Application filed october 2,'f1ii2o,fseriai No; ai'aeea. 'lR-eiewea tieren 16,1922. sferial no. ,544369.

To all fra/wm t may concern.'

Be it known `that I, Padana Bf'JorINsoN,

a citizen of the'UnitedStates; residing" at Seattle, in the countyof King and State of lllfashington, have invented abertain new and useful e Improvement' in` Thermostats, ot' which 'the` tollowingis a specification.

My invention relates to improvements in between the source ot 'Huid fuel yand thesaid burner is automatically closed thermodynamic action upon cooling,`thereby eliminating any possibility ot' explosion or lire.

Another object islto provide a vthermostat which will functionally `retain a v'a'lveiin"` a fixed position relative to the constant amount oit-heat, thereby insuring a steady supply of fluid fuel. 7

A further object is to provide a thermostat embodying simplicity, durability and economy in construction, that may be readily applied to oil burners, that is positive and etlicient in operation and that will not readily get out of order.

Wfith the above and other objects in View which will appear as the description proceeds the invention consists oi' the novel construction, arrangement and combination of parts hereinafter described and claimed.

l accomplish these objects by devices illustrat-ed in the accompanying'drawings, whereiii-- Figli re l. is a View in ]i erspective oil a thermostat embodying the lFeatures oit my invention; and i y Fig. 2 is a view in side elevation ot same attached to an oil burner.

Referring to the drawings, throughout which like reference numerals designate like parts, the numeral 10 designates a. thermostatic bar having an aperture 11 1n one end the opposite end thereof being slightly en-y larged as at 12. e

Downwardly projecting standards 13 and 14C are rigidly securedto the enlarged portion 12 and a downwardly depending arm 15 is pivotally secured thereto as at 16.

A, valve 17 is lixedly secured to the lower end ot the standard 18 and is provided with Va tubular shank 18adapted to beconnectedtoititl reducedpipe 2G arranged to Gil communicatewith the valve 17r andfhas an enlarged ,coupling member 27 provided "on its oppo'site Aend.` the arm 15.` l

3In 2 oflthe drawings, `lfhave shown my thermostat applied to 'one form 'of 'an oil burner 29' `wherein the aperture 11 provided inthelthermostat bar'l() isiitted over "A hole 28 isV provided in Itliefupper reducedporti'on of1 an end plate 8() and is thereby held against thrust movement.

The enlarged portion 12 of said bar 10 is s-lidably mounted in a slot provided in the upper portion of an end plate 31 and the arm 15 is fulcrumed to a bracket 32 lixedly secured to said end plate by a pivot pin '33 which is passed through the hole 2S.

The coupling 27 is co-nnectively secured to the burner coil 34 functionallynioimted in the burner 29 and having an outlet orV burner end Referring to Fig. of the drawings it will be obvious that when initial heat is created by lighting the priming fluid ituel the thermostat bar l() will become heated and will expand. As the bar 1() is secured against longitudinal movement at the point 11, it will expand lengthwise from this point andthe enlarged portion 12 will slidably move to the left as said bar becomes elongated# v The arm 15 being pivotally connected withthe bar l() as at 16, and tulcrumed to the burner 29 as at 33 will be actuated to the position shown in Fig. 2 and thelower end of same will carry the upper end of the lever arm 2O therewith thus opening` the valve The standards Q13 and 1 4 being rigidly secured tothe bar 10 will move in unison therewith and it will be obvious that may be ignited at the-burner outlet- 35. ik

the counter movement thereof Will assist the functional operation of the valve 17.

Liquid fuel now being free to enter theA burner through the opened valve 17 will become gasified Within the burner coil 34 and constant radiation of heat will be diffused v'through the burner and the bar 10 will thereby assume a constant length holding the valve 17 open ata fixed point and thus permitting `a steady supply of fuel to enter the burner,` n a l ylf at any time the burner shouldy accidentally or otherwise become extinguished when unattended it will be obvious `that 'the cooling and contraction of the bar 10 will automaticallyclose the valve 17 thereby eliminating the danger of fiooding the burner withfuel and the consequent possibility of explosion and re. It will be apparent that the valve 17 may be settoany ang'ularposition by means of `the screw 21; y

From the foregoing description taken in connection with the accompanying drawings the advantages of the construction and the method of operation of thermostat will be readily apparent to those skilledin the art to which the invention relates, butgwhile I have described the principle of the operationofthe invention together with the device which I now consider tobe the best embodiment thereof, I desire to have it un- I Vder'stood lthat* the thermostat ,shown is ing `composed of material adapted to beg functionally elongated byheatin'g and contracted `by cooling, downwardly projecting .standardsl rigidly'secured to the free end' of said the'rmost'atic bar, a valve adapted to control the supply of the fluid fuel for aheat generating device fixedly secured to the lower end of one `of said standards, a stem 4on said valve having fone end pivotally mounted in `the other'o'f said standards, a lever arm adjustably securedv to said stem, an` arm pivotally secured yt said thermo.- staticbar and adapted to be fulcrumed to a heat generating dev-ice, and said arm being pivotally connected to said lever arm and adapted to open and close said valve by expansion and contraction ofs'aid thermostatic bar. i

' In witness whereofl hereunto subscribe my yname this 19thday of October D.

i920. e y PETER B. JOHNSON. 

